Stenciling-machine.



UNITED STATES PATENT OFFICE.

BURNHAM C. STIOKNEY, OF ELIZABETH, NEW JERSEY ASSIGNOR TO UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

STENClLlNG-MACHINE.

Specification of Letters Patent.

Patented May 14, 1907.

.hlplicaticn filed June 14, 1906. Serial No. 321 510.

To all whom it may concern;

Be it known that I, Bnnnniin C. Srrore NEY, a citizen of the United States, residing in Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Stenciling- Machines, of Which the following is a specilication.

This invention relates to that class of duplicating machines in which a perforated stencil-carrying drum, or in other Words a cylindrical ink-screen, is covered with an inking blanket, the ink being applied upon the interior Wall of the cylinder or drum, and oozing through the perforations to the blankct, anda stencil sheet being laid upon the.

blanket; the sheets to be stonciled being then run between the stencil sheet and a pressure roller. i

According to the present improvements, the cylinder is open at both ends so that ink can conveniently be introduced at either end; and at the ends of the cylinder sets of balls are provided upon which the cylinder turns The cylinder has heads which form ball tracks; and fixed rings are set upon the framework and provided with corresponding ball tracks. The cylinder is releasebly held against endwise displacement, and so constructed that it is only necessary to release a latch, whereupon the cylinder may be drawn off from its bearings for the purpose of cleaning, etc.

The accompanying drawing is a longitudinal sectional elevation of a stenciling machine embodying my improvements.

The screen is 1n the form of a sheet metal plate having perforations 1 and curved to form a hollow cylinder 2, the plate being joined at its ends to the usual bar which is usually provided with means for holding the ink pad and stencil. At one end the cylinder is provided with an interior annular head 3, having a cupped ball track 4. ring 5, secured by screws 6 to a bracket 7 erected upon a base 8, is provided with a coned track 9 to co-operate with the track 4 to form a race for a set of balls 10. The ring 5 has a large internal diameter, so that this end of the cylinder is substantially entirely open for the introduction of ink 11 on the screen. At its opposite end, the cy index" is A supporting provided with an exterior annular head 31 which has an exterior cylindrical bearing 12 for a set of balls 13. A bracket 14 having a ring 15 surrounds the head 11, and provided with a groove 16 to receive the balls 13.

The ring 15 is U-shaped in cross-section.

Endwisc displacement of the cylinder,- to the right is prevented by the ring 5. Dis placement in the opposite direction is prevented by a roll 17 which engages an exterior flange 18 formed upon the head 11; said roll having a stem 19 journaled in a post 20, so that the roll 17 may turn to accommodate the revolution of the cylinder 2.

The roll 17 is deprcssible, so that when it is desired to Withdraw the cylinder from the machine, it is only necessary to depress said roll, whereupon the cylinder is released and may he pulled to the left, and out of the machine, the cylinder passing freely through-the ring 15, Whose least internal diameter is considerably greater than the external diameter of the remainder of the cylinder.

VVhon the cylinder is withdrawn the balls lfi'm'ay be retained by an annular cage 21, the latter being retained by a cap ring 22, secured upon the inner side of the ring support 5. The balls 13 may be retained by a cage 23 which is confined in the groove 16. When the cylinder is replaced the roll 17 is ressed up by a spring 24. It will be seen t rat the roll 17 operates as a spring latch for releasably holding the cylinder on the machine. Any suitable means may be proridedior effecting relative adjustment of the ball tracks 4 and 9, as by shifting the bracket 7 to the left or the post 20 'to the right; and the construction of the heads, rings etc... may be greatly varied.

The nsuai spring pressed pressure roll bencath the cylinder is seen at 25. A handle 26 may be secured to a boss 27provided u on the head 11 or the handle may be place at the other end of the cylinder, as at 28, and extend within the ring 5 and have an elbow 29 secured to the head 3.

The cages 21 and 23 may have any usual construction for retaining the balls. It is usual to form ball-retaining rings with apertures to receive the balls, and wherein the balls may freely turn, the apertures being however constructed to prevent the balls from l'alling out. Such apertures are usually too small for the balls to pass through, but large enough in each instance to permit the protrusion ol portions of the ball thereinto. 'lhe ring ill is therefore formed with a roll or head 3|), ol' a diameter somewhat less than the diameter of the balls, and formed at intervalsavith perforations or sockets to receive the balls, said )erl'orations being too small to permit the bal ls to escape toward the left in the drawing. 'lhe cage 23 is substantially in the Form of a tube rectangular in cross-section, and perforated radially to form pockets for the balls, the perlorations being too small to permit escape of the balls in a direction toward the axis of the cylinder.

Having thus described my invention, I claim:

1. A stenciling machine comprising an ink screen in the form of a cylinder open at both ends and having at one end an annular head provided with a ball track, a fixed supportmg ring provided with a corresponding ball track, a set of balls running upon said tracks, an annular head upon the opposite end of the cylinder, and means co-operating with said head to revolubly support the same and prevent endwise displacement of the cylinder.

2. A stenciling machine comprising an ink screen in the form of a cylinder open at both ends, an annular head at one end of the cylinder, a supporting ring, said head and ring formed with coned tracks, halls running u )on said tracks, a head upon the opposite en of the cylinder and provided with means including a set of balls, whereby it is revolubly sup- )o1ted and means i' or neventing cndwise displacement of the cylinder.

23. A stenciling machine comprising an ink screen in. the form of a cylinder open at both ends, an annular head at one end of the cylinder, a suiporting ring, said head and ring formed with coned tracks, balls running u on said tracks, a head upon the opposite end of the cylinder and having a cylindrical annular track, a fixed supporting ring having a corresponding track, a set of balls running upon the last mentioned track, and means for preventing endwise displacement of the cylinder.

4. A stenciling machine comprising an ink screen in the form of a cylinder, and means supporting said cylinder by its ends, including an exterior annular head upon one end of the cylinder, and a bracket having an annular portion surrounding said head, the bracket and head having tracks co-operating to form a ball race, and a set of balls in said race; said tracks being cylindrical, and means being provided for reventing endwisc displacement of the cylinder.

5. A stenciling machine comprising an ink screen in the form of a cylinder open at both ends, and means engaging the cylinder near its periphery at its ends for revolubly supporting the same, said supporting means ineluding a set oi balls for each end of the eylinder, and means being provided for releasably securing the cylinder upon its supports.

(3. A stenciling machine comprising an ink screen in the form of a cylinder open at both ends and having annular heads at its ends, each head having a ball track, iixed support ing rings having ball tracks, and sets ol balls running upon said tracks, and a latch for preventing cndwise displacement of the cylin der.

7. A stenciling machine comprising an ink screen in the form of a cx lindcr open at both ends and having annular heads at its ends, each head having a ball track, 'lixed supporting rings having ball tracks, and sets of balls running upon said tracks, and a latch for preventing endwise displacement of the cylinder, said latch being in the form of a roll which engages one head of the cylinder and is movable away from said. head, a spring being provided to retain said roll in normal position.

8. A stenciling machine comprising an ink screen in the form of a cylinder open at both ends, an annular head. at one end of the cylinder, a supporting ring, said head and ring formed with coned tracks, balls running upon said tracks, a head upon the opposite end of the cylinder and provided. with means including a set of balls, whereby it is revoluhly supported; the last-mentio131ed head having a flange, and a latch for preventing endwise displacement of the cylinder, said latch having a roll to bear upon said flange.

9. A stenciling machine comprising an ink screen in the form of a cylinder open at both ends, an annular head at one end of the cylinder, a supporting ring, said. head and ring formed with coned tracks, balls running upon said tracks, a head upon the opposite end. of the cylinder and having a cylindrical annular track, a fixed. supporting ring having a corresponding track, a set of balls running upon the last-mentioned track, and a releasable roll running upon the lastmcntioned head to prevent endwise displacement of the cylinder.

10. A stenciling machine comprising an ink screen in the form of a cylinder open at both ends, two sets of balls upon which said cylinder turns, fixed annular tracks in which said balls run, and releasable means for preventing endwise displacement of the cylinder.

1 1. A stenciling machine comprising a cylindrical ink screen, two sets of balls whereon said screen turns, one set at each end of the cylinder, rings in which said balls run, means releasably holding the cylinder, and means for retaining said balls upon said rings when the cylinder is Withdrawn from the machine.

]2. A stenciling machine comprising a cylindrical ink screen having at one end. an interior head formed with a ball track, a supporting ring having a corresponding rm-k, imiis Jniinvd iHi'IXVfPH said nsufiia, am? a handle 590mm upon said head and prajeiting through said iifig. 7

13, A SiQiMiiifig illfiiiliilt culnprising a r vlinriaicai ink screen imving means upun which it rieii'aaszibiy and revulubly suppurtcd said supporting muzuls ini-huiing :1 head PlHYiiiPii 1pm 110 (:Viifilii! and formed W311 & bail tun-k. a ring i i-Living a coiivspnni'iing hall travk and hails onfincd within said tiafiks. 1-1. A stenciiing machine iromprising at (ya 

